Unless they were disturbing those around them, it shouldn't have mattered. If they got caught because someone was being nosy and trying to see what was on their phone, then... well they should have minded their own business. If they had the volume up or acting loud and excited about it, showing it off, then I have no complaints with them getting in trouble.

Hard to understand Google translation...
"It's a problem that four guys can check on violent pornography in the subway, without any say from. People are dulled. It's easy to talk about equality and structures, but we have to do something too. Everyone should speak up. Hope that girl on the subway took with him what I did and tells him next time - if she is comfortable with it, says Johanna. "
???

ANyway, what they did was crude and inappropriate. But not that uncommon for people of that age. (and yeah I know not all teens are like this, no need to tell me).

I notice people are more likely to do stupid things when they are in a group. They are less likely to do stupid things when by themselves.

This is pretty damn funny.But it's not funny how they were watching it next to a little girl

It wouldn't be funny even if there wasn't a underage girl there. Think about it, if you went on the subway and heard/saw people scream out things like "F*** YEA; SHOVE THAT UP HER v****a" on a train then I'm pretty sure that you'd be kinda grossed out by it.

Hard to understand Google translation...
"It's a problem that four guys can check on violent pornography in the subway, without any say from. People are dulled. It's easy to talk about equality and structures, but we have to do something too. Everyone should speak up. Hope that girl on the subway took with him what I did and tells him next time - if she is comfortable with it, says Johanna. "
???

ANyway, what they did was crude and inappropriate. But not that uncommon for people of that age. (and yeah I know not all teens are like this, no need to tell me).

I notice people are more likely to do stupid things when they are in a group. They are less likely to do stupid things when by themselves.

Here's a quick run down of what happened;

A underage girl goes on a train, 3 older boys goes on the train and sits on the same seat row. The boys proceeds to start watching porn and view sexual images on their phones while the underage girl is basically forced to watch the porn material on their phones since they were all around her. Then the boys starts to shout out things like "F*** YEA; SHOVE THAT UP HER v****a" etc. Then they make all the passengers around them uncomfortable whit their conversation shouting to the point where another passenger decides to takes their phones and calls their parents what they were doing. Including sharing the links they were viewing.

Off topic.

Also, I can confirm that this is correct "people are more likely to do stupid things when they are in a group".

I used to know someone who absolutely hated Nazis a few years ago, then he met some people and now he is all for it. Btw, I don't have any contact whit him anymore since I don't agree whit the Nazi way of thinking.

My Ex would watch that stuff right next to me Whenever i would take a nap.
He had it on mute thinking i wouldnt notice.

I guess some guys just cant help them selfs.

Something seems really wrong there.

Yeah
thats why he an Ex hehe..

i attract weirdos

Oh... I thought he was an Ex, 'cause you expected him to help himselfs too often.... That clears everything up. You were attracting weirdos, and that's why he's an Ex. (Joking, obviously. Sorry. Couldn't help myself.)

As I read about this on another forum already I'll help and clarify a few things as the article can't be fully translated due to de main text being an image:

A couple of teenagers were not only watching porn on the train, they were terribly loud and obnoxious about it to the point where fellow passengers were visibly starting to get very uncomfortable.
The guy who's facebook status you see (which is untranslatable); Before he steppd off the train he went to the loudest kid, took his phone and called the lad's mom to tell (and show) her what her dear son had been up to and where she could pick up the precious phone.

In my personal opnion:
The man did the right thing, I don't mind people watching such things, not even in public places, but when it comes to actually harassing people with it.
I'd have done the same.

You seem to have most of the information correct, however there's a few important details that you missed out on.

First of all, there were three 16 year old boys who did this and there just so happened to be a 14 year old girl sitting beside them.

And then they started saying things like "hell yea, shove that hand up her". And this of course affected the girl in a bad way. The girl probably wanted them to turn off the porn. But was scared of what the boys would've done to her if asked them to, and then she started to using body language so that someone could help her make them turn off the videos as well as stop being so loud. This is from the perspective of the one who took their phones

It seems the boys were bullying her. The poor girl is probably traumatized.